Visual-cue sensorimotor training

The system provides visual targets and rhythmic cues that the patient moves to. In Parkinson's disease in particular this works because the internal movement-initiation system is impaired while the response to external cues is largely preserved — a patient frozen in a doorway can often step over a projected line.

The same principle drives attention, timing and coordination training in other conditions: an external signal supplies the structure the nervous system is not currently generating.

Parkinson's disease with freezing of gait and reduced step length. Stroke and brain injury with attention or neglect. Coordination disorders. Balance retraining. Also in children with developmental coordination difficulty.

It works well as a bridge: cues are used to establish the movement, then faded so the patient carries it without them.

A patient who walks well only with the system on has learned to use the system, not to walk. Cue fading is deliberately programmed, and the home programme teaches self-generated cueing — counting, a metronome app, a rhythm — so the strategy travels home.

This is the part most often skipped, and it is the part that determines whether anything lasts.

External cues — a rhythm, a line on the floor, a visual target — allow movement that internal initiation cannot produce. This is most striking in Parkinson’s disease, where someone frozen in a doorway can step over a projected line.

The training aim is to make the cue portable: a rhythm the person can generate themselves, a strategy they can use at home when no equipment is present.

In Parkinson’s disease it is strong enough for a guideline. The American Physical Therapy Association’s clinical practice guideline recommends external cueing — rhythmic sounds, visual targets, spoken or attentional cues — to reduce the severity of motor symptoms and freezing of gait and to improve walking, based on 13 high-quality and 16 moderate-quality studies 1. In those studies cueing was typically practised two to five times a week for three to eight weeks, and the guideline found no study that measured whether it reduces falls 1.

Which kind of cue adds most is less certain. A 2024 review of ten small trials found that adding rhythmic sound cues to walking training increased walking speed slightly more than walking training alone, whereas adding visual cues did not measurably improve speed or stride length; effects on freezing, and whether any gain lasts, remained uncertain 2. The quality of that evidence is low 2. Visual targets are therefore used as one part of gait training, alongside rhythm and self-generated cues, rather than as the whole of it.